eerdman



(No Modl.) n 4 Sheets-'Shed 2.

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E-LEVATGR. No. 507,617. Patented Oct. 31; 1893.

(No Model.)

F. E. H'RDMAN.

ELEVATUR.

Pafnented Oct. 31, 1893.

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F. B. HERDMAN BLEVATOR.

N0. 507,617". i 1 Patented 0013. 31, 1893.l

0 n 1?@ o 1 o 3l m/ K s C@ i) v G) o n /U\ MQW NrrnD STAT-Es PATENTGrafen.

FRANK E. HERDMAN, OF INDIANAPOLIS, INDIANA.

ELEVATOR.

' SPECIFICATION forming part of Letters Patent No. 507,617, datedOctober 31, 1893. Application filed November 22, 1892. Serial No.452,786. (No model.)

To a/ZZ whom it may concern.-

Be it known that I, FRANK E. HERDMAN, a citizen of theUnited States,residing atIndianapolis, county of Marion, and State of Indiana, haveinvented anew and useful Improvement in Elevators, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, which form a part of this specification.

My invention relates to that class of elevators in which travelingsheaves are used and consists in certain combinations to be hereinafterparticularly set out whereby an improved result is obtained.

I will'describe my construction as applied to 'an elevator driven by anelectric motor, although, except wherein that class of motor isessential, the saine may be used with other sources of power thanelectric.

In the drawingsz-Figure 1 is a side elevation of the elevator drivingapparatus. Fig. 2 is a detached sectional view on the line :1c-, Fig. 4.Fig. 3 is a detached side elevation of elevator driving mechanism onenlarged scale. Fig. 4 is a plan view of elevator driving mechanism.Fig. 5 is a front ele- Vation of elevator shaft and counter-balancemechanism. Fig. 6 is a front elevation of elevator shaft and connectionbetween the elevator and elevator driving mechanism. (In Fig. 6 thecounterbalance sheaves are removed so that the driving sheaves may beshown.) Fig..7 is a view, in side elevation, of the elevator shaft,showing connection between the car and the operating vsheave.

25 is an electric motor of vwhich 26 is th shaft.

27 is a brake wheel for the motor shaft.

B is a nut coupled to the brake wheel and motor shaft so as to revolvewith the motor.

shaft. This nut has a ange O, the purpose of which is to take the endthrust bearing in either direction. The ange C is placed in a chamber orbox D which contains oil. The shaft 26 is made hollow, as willhereinafter be fully described. To the right of the elevator operatingmechanism are -placed the sheaves E, the said sheaves being mounted onthe stand E. The stand E holdingthese sheaves is connected by rods F Fto the casing or frame Work of the machine. Between these rods is across-head H provided with rollers I I which travel upon said rods F, F.To the crosshead H is attached the rod J threaded at one end, and onwhich threaded end the nut B works. l

lo is a shaft secured to the crosshead H by frame lo It. On this shaftlo are placed the sheaves K. It can be readily seen, as the motoroperates in either direction, the revolution of the nut B causes thescrew J to travel in one direction or the other, according to thedirection of the motor, which moves the crosshead H in the correspondingdirection, and with it travel sheaves K. Lifting cables from .the car 28pass down from overhead sheaves 29 around one of the sheaves E and backand around one of the sheaves Kaud thence around the next sheave E, andcontinues thus until the desired gear of the machine is 0btained, thecables being iinally attached to a lug on the frame carrying the shaftsof the sheaves E. If the operator desires that the elevator shallascend, the motor is operated so as to draw the sheaves K from thesheaves E, thus drawing the cables and lifting the car. lf he desires todescend, the motor is operated so as to cause the sheaves K to traveltoward the sheaves E, thus allowing the car to fall.

In order to arrange for partially counterbalancing the load so that whenlifting a full load the motor need only operate to lift a proportionatepart of that load and the counterbalance carry lup the remaining part,and when descending, the motor has to act only against thecounterbalance, the following mechanism is used: To the shaft lo,carried by the cross-head H, on either side are placed the sheaves L,and upon a shaft to the rear of the cross head are placed sheaves m.Upon each end of the shaft carrying the sheaves E are placed sheavesN.Cable or cables prefably two) pass from a counterbalance, 30, around thesheaves 3l, down from the top of the shaft, one around one sheave N, andone around the other sheave N. These pass directly back and in each casearound one sheave M, thence around one sheave L, and

continue around these two sets of. sheaves, L

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to force the crosshead of the screw in that direction. If the car withits load tends to draw the sheaves K toward the sheaves E, inconsequence the work done to lift the car is the dierence between thisdraft and the one due to the counter balance between the sheaves L andM. If the car comes down empty of course, there is no draw between thesheaves E and K,and, in consequence, the sheaves K must travel towardthe sheaves E. For the car to descend, the motor must do an amount ofwork sufficient to lift the counterbalance attached to the cablespassingaround sheaves L and M; and in ascending, the motor must do work equalto the difference of the load in the ycar and the weight of thiscounterbalance, and by this means, a partial counterbalancing of theload in the car is obtained, which lessens the maximum strain upon themotor. The following mechanism is provided to automatically stop theelevator at its greatest height and at the lowest point of its travel. Arod O is placed in the line of travel of the "crosshead I'I, and uponthis rod at points `corresponding to the eXtreme end of the travel ofsaid crosshead, in either direction, are placed bell-cranks P. To thecrosshead is attached an arm Q, in such position that it is adapted tostrike the arm of the bellcrank P. The arm Q can, if desired, have atits `end'a roller q. The end of the rod O passes through the orifice inthe stand o and has surrounding said rod, springs R and R. The rod O 'isalso provided with a slot through which 'a pin S, upon the operatingsheave A, passes, this operating sheave A being connected in theordinary manner with the elevator and with the source of power. Vhen therod O is in its central position this slot is so located that theoperating sheave can be thrown to its full extent in either direction.The lower arm of each bell crank P when in the central position hassufficient incline downward, so that when the sheaves K reach that -endof the travel the arm Q of the crosshead strikes the lower arm of thisbell crank and straightens it, and in this way, carries the rod O in theopposite direction to the throw of the operating sheave A. As eitherthrow of the operating sheave A is sufficient to carry the pin to theend of the slot in the rod O,the movement of the rod O brings this pinback to the central position and consequently stops the elevator. Therod O is held in this position until the `elevator is started in theopposite direction. To operate it in the opposite direction, ofcourse,the pin on the operating sheave is free to move in the slot in the rod Oin that direction, and as soon as the arm Q on the cross head is freefrom the hell crank P the springs R and R bring the rod to its centralposition. The springs R and R may be dispensed with as the rod O is freeto move when the arm Q has left the bell crank P, and, in consequence,when the cross-head reaches `the other end of the travel the arm Qstrikes the other bellcrank P and the power is again shut off in themanner before described.

By my arrangement of causing the nut to revolve and the screw to befixed I am able to keep the nut which has the greatest work to performalways in a bath of oil. If a construction were used where the screwrevolved, and the nut were placed in the crosshead so that it, not thescrew, traveled, it is very diflicult to keep it properly lubricated,and by causing the nut to revolve, as before stated, and the screw totravel, I can always keep the nut perfectly lubricated, and the shaft,being hollow, the screw can pass directly back through the center ofthis bath, as the sheaves draw toward the motor. The chamber Dcontaining oil, the nut and the end thrust bearings are kept constantlywell lubricated.

Having now fully described .my invention, what I claim, and desire toprotect by Letters Patent, is-

l. In combination with a motor, a shaft operated by said motor, a nutsecured to and revolving with said shaft, traveling sheaves, a crosshead to which said sheaves are connected, a threaded rod, connected tothe travcling sheaves and adapted to work in said nut, the end of saidmotor shaft being hollow and said rod being adapted to enter said hollowshaft, an elevator car and lifting cables connecting said sheaves andelevator car.

2. In combination with a motor, ashaft operated by said motor, a nutsecured toland revolving with said shaft, a chamber or box adapted tocontain a lubricant in which said nut revolves, traveling sheaves, across head to which saidsheaves are connected, athreaded rod, connectedto the traveling sheaves and adapted to work in said nut, an elevatorcar and lifting cables connecting said sheaves and elevator car.

3. In combination with a motor, a shaftoperated by said motor, a nutsecured to and revolving with said shaft, a chamber or box adapted tocontain a lubricant in which said nut revolves, traveling sheaves,across head to which said sheaves are connected, a threaded rod,connected to the traveling sheaves and adapted to work in said nut, theend of said motor shaft being hollow and said rod being adapted to entersaid hollow shaft, an elevator car and lifting cables connecting saidsheaves and elevator car.

et. In combination with a motor, a shaft operated by said motor, a nutsecured to and revolving with `said shaft, said nut being provided witha flange, a chamber or box adapted to contain a lubricant in which saidiiange is placed, traveling sheaves, a cross head to which said sheavesare connected, a threaded rod, connected to the traveling sheaves andadapted to work in said nut, an elevatorcar and lifting cables`connecting said sheaves and elevator car.

5. In combination with an operating sheave,

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1 connection between said sheave and theelevator car and between saidsheave and the source of power, of al rod having a slot which surroundsa pin upon the operating sheave, a lever secured to said rod, travelingsheaves, an arm carried by the traveling sheaves support and in suchposition that in its movement it is adapted to strike said lever.

6. In combination with an operating sheave connection between saidsheave and the elevator car and between said sheave and the source ofpower, of a rod having a slot which surrounds a pin upon the operatingsheave, said slot being of size sufcient to allow full throw of theoperating sheave, a lever secured to said rod, traveling sheaves, an armcarried by the traveling sheaves support and in such position that inits movement it is adapted to strike said lever.

7. In combination with an operating sheave, connection between saidsheave and the elevator car and between said sheave and the source ofpower, of a rod having a slotwhich surrounds a pin upon the operatingsheave, a lever secured to said rod, traveling sheaves, an arm carriedby the traveling sheaves support and in such position that it is adaptedto .strike said lever a stand through which said rod passes and a springupon said rod.Y

8. In combination with an operating sheave, connection between saidsheave and the ele vater car and between said sheave and the source ofpower, of a rod having a slot which surrounds a pin upon the operatingsheave, levers secured to said-rod, traveling sheaves, an arm carried bythe traveling sheaves support and in such position that in its movementit is adapted to strike said levers.

In'testimony of which invention I'have* hereunto set my hand. v

F. E. HERDMAN.

Witnesses:

W. V. MARTIN, E. B.KERR.

